S
M
T
W
T
F
S
30
89°
70°
31
90°
70°
1
90°
69°
2
89°
70°
3
90°
70°
4
90°
71°
5
89°
69°
6
89°
64°
7
88°
61°
8
80°
65°
9
79°
67°
10
78°
68°
11
86°
67°
12
84°
68°
13
86°
65°
14
86°
58°
15
81°
58°
16
74°
57°
17
75°
56°
18
76°
61°
19
78°
55°
20
74°
54°
21
74°
58°
22
75°
61°
23
79°
62°
24
81°
64°
25
82°
63°
26
81°
63°
27
82°
62°
28
80°
58°
29
78°
57°
30
78°
57°
1
77°
58°
2
80°
60°
3
71°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westport
Westport's September 2026 forecast shows daily high temperatures ranging from 71° to 90°, with overnight lows between 49° and 71°. The average high for September is 82° with an average low of 62°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Westport. See also: October | November | December.
